{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-fvn01j3e","versions":[{"created_at":"2026-07-26T06:03:52Z","element_count":130,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"123473474830d831871621c5bcb72d604340568bb7658ae1d4f6734dfc1f1425","version":2},{"created_at":"2026-07-26T06:03:48Z","element_count":130,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}